20747442 has 16 divisors (see below), whose sum is σ = 42175872. Its totient is φ = 6802320.

The previous prime is 20747437. The next prime is 20747459. The reversal of 20747442 is 24474702.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27978 + ... + 28709.

It is an arithmetic number, because the mean of its divisors is an integer number (2635992).

Almost surely, 2^20747442 is an apocalyptic number.

20747442 is an abundant number, since it is smaller than the sum of its proper divisors (21428430).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20747442 is a wasteful number, since it uses less digits than its factorization.

20747442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56753.

The product of its (nonzero) digits is 12544, while the sum is 30.

The square root of 20747442 is about 4554.9360039412. The cubic root of 20747442 is about 274.7819406356.

The spelling of 20747442 in words is "twenty million, seven hundred forty-seven thousand, four hundred forty-two".